#region Using Directives and Copyright Notice

// Copyright (c) 2007-2010, Computer Consultancy Pty Ltd
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in the
//       documentation and/or other materials provided with the distribution.
//     * Neither the name of the Computer Consultancy Pty Ltd nor the
//       names of its contributors may be used to endorse or promote products
//       derived from this software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
// ARE DISCLAIMED. IN NO EVENT SHALL COMPUTER CONSULTANCY PTY LTD BE LIABLE 
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
// DAMAGE.

using System;
using System.Collections.Generic;
using System.Text;

using Interlace.Collections;

#endregion

namespace Interlace.AdornedText
{
    public class Listing : Block
    {
        TrackedBindingList<ListingItem> _items;

        public Listing()
        {
            _items = new TrackedBindingList<ListingItem>();
            _items.Added += new EventHandler<TrackedBindingListEventArgs<ListingItem>>(_items_Added);
            _items.Removed += new EventHandler<TrackedBindingListEventArgs<ListingItem>>(_items_Removed);
        }

        void _items_Added(object sender, TrackedBindingListEventArgs<ListingItem> e)
        {
            // This actually violates the (implicit) invariant that a parent of a node has that node as a child,
            // and not just as a descendant:
            e.Item.Parent = this.Parent;
        }

        void _items_Removed(object sender, TrackedBindingListEventArgs<ListingItem> e)
        {
            e.Item.Parent = null;
        }

        public override BlockSequence Parent
        { 	 
           get { return base.Parent; }
           internal set 
           { 
               base.Parent = value; 

               foreach (ListingItem item in _items)
               {
                   item.Parent = value;
               }
           }
        }

        public IList<ListingItem> Items
        {
            get { return _items; }
        }

        public override void Visit(NodeVisitor visitor)
        {
            visitor.VisitListing(this);

            foreach (ListingItem item in _items) item.Visit(visitor);

            base.Visit(visitor);
        }
    }
}
